Lamarckism (Grade 12 NSC Matric Life Sciences): Flashcards
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Jean-Baptiste Lamarck
Jean-Baptiste Lamarck
French naturalist who proposed species change over time
Lamarck's main proposal about species
Lamarck's main proposal about species
Species not fixed but could change over time through evolution
Law of use and disuse
Law of use and disuse
Used structures become larger/stronger, unused become smaller
Effect of frequent use (Lamarck)
Effect of frequent use (Lamarck)
Structure becomes larger and stronger in next generation
Effect of rare use (Lamarck)
Effect of rare use (Lamarck)
Structure becomes smaller, might eventually disappear
Law of inheritance of acquired characteristics
Law of inheritance of acquired characteristics
Traits developed in lifetime can be passed to offspring
Lamarck's giraffe neck explanation
Lamarck's giraffe neck explanation
Giraffes stretched necks, became longer, passed to offspring
Why Lamarck was wrong
Why Lamarck was wrong
Acquired characteristics cannot be inherited
Why acquired traits can't be inherited
Why acquired traits can't be inherited
Physical changes don't alter genetic code
Historical importance of Lamarck
Historical importance of Lamarck
Challenged belief species fixed, introduced evolution concept